Manufacturing Technology 2024, 24(4):626-635 | DOI: 10.21062/mft.2024.057

The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys

Jakub Mráz ORCID..., Totka Bakalova ORCID...
Faculty of Mechanical Engineering, Department of Materials, Technical University of Liberec, Studentská 2, 461 17 Liberec. Czech Republic

This article explores the effect of cryogenic temperatures on the properties of cobalt alloys, specifically Stellite 6 and Stellite 12. These alloys are commonly used in applications that require resistance to me-chanical, thermal, and chemical wear. In this study, the focus is on the valve seats for internal combus-tion engines, which are made from cobalt alloys and undergo a freezing process before assembly into the cylinder head. The purpose of freezing is to reduce the diameter of valve seats, making them easier to fit into the cylinder head. However, the length of time spent in freezing can significantly affect the hardness and tribological characteristics of the material.

Keywords: Cobalt alloys, Cryogenic treatment, Tribological properties, Valve, Valve seats

Received: February 26, 2024; Revised: May 10, 2024; Accepted: June 17, 2024; Prepublished online: August 2, 2024; Published: September 1, 2024  Show citation

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Mráz J, Bakalova T. The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys. Manufacturing Technology. 2024;24(4):626-635. doi: 10.21062/mft.2024.057.
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